/* Student Hub styles (verbatim class names + values from public/student-hub-combined.css) */
.hub-body{font-family:var(--hub-font-body);background:linear-gradient(135deg,#f5f3ed 0%,#fff 100%);min-height:100vh;margin:0;padding:0}
.activity-header-v4{background:linear-gradient(135deg,var(--hub-dark-green) 0%,var(--hub-medium-green) 100%);padding:1.5rem 0;box-shadow:0 4px 12px rgba(0,0,0,0.1);position:relative;overflow:hidden}
.activity-header-v4::before{content:'';position:absolute;top:-50%;right:-10%;width:50%;height:200%;background:var(--hub-light-green);opacity:0.2;transform:rotate(45deg)}
.header-content-v4{max-width:1200px;margin:0 auto;padding:0 var(--hub-padding);position:relative;z-index:1;display:flex;align-items:center;justify-content:space-between}
.header-left-v4{display:flex;flex-direction:row;gap:1.5rem;align-items:baseline}
.logo-text-v4{font-family:var(--font-bubbly);font-size:2rem;font-weight:600;color:white;text-decoration:none;letter-spacing:0.5px}
.hub-title-v4{font-family:var(--font-clean);font-size:1.5rem;font-weight:500;color:var(--hub-cream);opacity:0.95;margin:0;display:inline}
.main-container-v4,.category-spotlight-v4,.library-section-v3{max-width:var(--hub-container);padding:0 var(--hub-padding);margin-left:auto;margin-right:auto}
.main-container-v4{margin-top:3rem}
/* Featured game panel */
.featured-game-v4{background:white;border-radius:20px;padding:2rem;box-shadow:0 10px 40px rgba(0,0,0,0.08);border:3px solid var(--hub-bright-green);display:grid;grid-template-columns:1fr;gap:2rem;margin-bottom:4rem}
@media (min-width:968px){.featured-game-v4{grid-template-columns:minmax(0,3fr) minmax(260px,1.5fr);padding:2.5rem 3rem;align-items:stretch}}
.game-area-v4{background:#0b0b0b;border-radius:12px;overflow:hidden;min-height:350px;display:flex;align-items:center;justify-content:center;position:relative}
.game-info-v4{display:flex;flex-direction:column;justify-content:space-between;gap:1.5rem}
.game-badge-v4{display:inline-block;padding:0.5rem 1rem;background:var(--hub-accent-orange);color:white;font-size:0.75rem;text-transform:uppercase;letter-spacing:1.2px;border-radius:8px;font-weight:600;font-family:var(--hub-font-body);width:fit-content}
.game-title-v4{font-family:var(--font-bubbly);font-size:clamp(1.75rem,4vw,2.25rem);font-weight:500;color:var(--hub-dark-green);margin-bottom:1rem;line-height:1.2}
.game-description-v4{font-family:var(--font-clean);font-size:1.1rem;color:#444;line-height:1.7;margin-bottom:1.5rem}
.science-questions-v4{background:linear-gradient(135deg,#f0fdf4 0%,#ecfdf5 100%);padding:1.25rem;border-radius:12px;margin-bottom:1.5rem;border-left:4px solid var(--hub-bright-green)}
.question-label-v4{font-family:var(--font-clean);font-size:0.85rem;font-weight:600;color:var(--hub-medium-green);text-transform:uppercase;letter-spacing:1px;margin-bottom:0.75rem;display:flex;align-items:center;gap:0.5rem}
.question-label-v4::before{content:'\1F914';font-size:1rem}
.question-text-v4{font-family:var(--font-clean);font-size:1rem;color:var(--hub-dark-green);line-height:1.6;font-weight:500}
.game-navigation-v4{display:flex;justify-content:center;gap:1rem;flex-direction:row}
.nav-arrow-v4{padding:0.5rem 1.25rem;background:white;border:2px solid var(--hub-bright-green);color:var(--hub-bright-green);border-radius:40px;font-family:var(--font-clean);font-size:0.9rem;font-weight:600;cursor:pointer;transition:all 0.3s ease;display:flex;align-items:center;gap:0.4rem}
.nav-arrow-v4:hover{background:var(--hub-bright-green);color:white;transform:translateY(-2px);box-shadow:0 4px 12px rgba(74,155,92,0.3)}
.nav-arrow-v4:disabled{opacity:0.3;cursor:not-allowed;transform:none}
/* Category cards */
.category-header{text-align:center;margin-bottom:var(--hub-space-xl)}
.category-section-title{font-family:var(--font-bubbly);font-size:clamp(1.75rem,5vw,2rem);color:var(--hub-dark-green);margin-bottom:var(--hub-space-sm);font-weight:500}
.category-section-subtitle{font-family:var(--font-clean);font-size:1.1rem;color:#666;font-weight:400}
.category-cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:var(--hub-space-lg)}
.category-card{background:white;border:2px solid #e7e1cf;border-radius:16px;padding:var(--hub-space-lg);transition:all 0.3s ease;position:relative;overflow:hidden;cursor:pointer;box-shadow:inset 0 1px rgba(255,255,255,0.3),0 2px 8px rgba(0,0,0,0.05)}
.category-card:hover{transform:translateY(-4px);box-shadow:inset 0 1px rgba(255,255,255,0.3),0 8px 20px rgba(0,0,0,0.12)}
.category-card::before{content:'';position:absolute;top:0;left:0;width:100%;height:4px;transform:scaleX(0);transform-origin:left;transition:transform 0.4s ease;background:var(--cat,var(--hub-light-green))}
.category-card:hover::before{transform:scaleX(1)}
.category-icon{width:48px;height:48px;display:block;margin-bottom:var(--hub-space-md);transition:transform 0.3s ease;color:var(--cat);stroke:var(--cat)}
.category-card:hover .category-icon{transform:scale(1.05)}
.category-card-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:var(--hub-space-sm)}
.category-title{font-family:var(--font-bubbly);font-size:clamp(1.25rem,3vw,1.5rem);font-weight:600;color:var(--hub-dark-green);letter-spacing:-0.3px}
.category-count{font-family:var(--hub-font-body);font-size:0.9rem;font-weight:600;padding:4px 12px;border-radius:12px;background:rgba(0,0,0,0.05);color:var(--cat)}
.category-description{font-family:var(--font-clean);font-size:1rem;color:#555;line-height:1.6;margin-bottom:var(--hub-space-md)}
.category-preview-label{font-family:var(--hub-font-body);font-size:0.85rem;font-weight:600;text-transform:uppercase;letter-spacing:0.5px;color:#999;margin-bottom:8px}
.category-preview-list{font-family:var(--font-clean);font-size:0.95rem;color:#666;line-height:1.5}
.category-preview{margin-bottom:var(--hub-space-md)}
.category-cta{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-clean);font-size:1rem;font-weight:600;text-decoration:none;transition:all 0.3s;position:relative;color:var(--cat)}
.category-cta::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background:currentColor;transition:width 0.3s ease}
.category-cta:hover::after{width:calc(100% - 24px)}
.category-cta:hover{transform:translateX(4px)}
/* Category theme variants */
.category-card.category-art{--cat:var(--hub-art);background:linear-gradient(135deg,#faf6f3 0%,#f5ede7 100%);border-color:var(--hub-art)}
.category-card.category-science{--cat:var(--hub-science);background:linear-gradient(135deg,#f4f8f7 0%,#e8f2f0 100%);border-color:var(--hub-science)}
.category-card.category-coding{--cat:var(--hub-coding);background:linear-gradient(135deg,#f7f6f9 0%,#f0edf3 100%);border-color:var(--hub-coding)}
.category-card.category-games{--cat:var(--hub-games);background:linear-gradient(135deg,#f9f5f6 0%,#f3e9ec 100%);border-color:var(--hub-games)}
.category-card.category-stories{--cat:var(--hub-stories);background:linear-gradient(135deg,#faf8f3 0%,#f5f0e7 100%);border-color:var(--hub-stories)}
.category-card.category-design{--cat:var(--hub-design);background:linear-gradient(135deg,#f7f5f2 0%,#eeebe5 100%);border-color:var(--hub-design)}
/* Library */
.library-header-v3{text-align:center;margin-bottom:var(--hub-space-lg)}
.library-title-v3{font-size:clamp(1.75rem,5vw,2rem);color:var(--hub-dark-green);font-weight:500;font-family:var(--font-bubbly);margin-bottom:10px}
.library-subtitle-v3{font-size:18px;color:#666;font-family:var(--font-clean);font-weight:500}
.library-grid-v3{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));gap:var(--hub-space-md);max-height:clamp(600px,70vh,900px);overflow-y:auto;padding:var(--hub-space-md);background:#faf8f3;border-radius:var(--hub-space-sm)}
.library-grid-v3::-webkit-scrollbar{width:10px}
.library-grid-v3::-webkit-scrollbar-track{background:#ECE7DF;border-radius:10px}
.library-grid-v3::-webkit-scrollbar-thumb{background:#5B8F55;border-radius:10px}
.library-card-v3{background:white;border:1px solid #e7e1cf;border-radius:8px;padding:20px;transition:all 0.3s;position:relative;overflow:hidden;box-shadow:inset 0 1px rgba(255,255,255,0.3),0 1px 4px rgba(0,0,0,0.04)}
.library-card-v3::before{content:'';position:absolute;top:0;left:0;width:100%;height:2px;background:#5B8F55;transform:translateX(-100%);transition:transform 0.3s}
.library-card-v3:hover::before{transform:translateX(0)}
.library-card-v3:hover{border-color:#5B8F55;box-shadow:0 4px 12px rgba(91,143,85,0.1);transform:translateY(-2px)}
.library-card-header-v3{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.library-emoji-v3{font-size:32px}
.library-card-title-v3{font-size:18px;color:var(--hub-dark-green);font-weight:500;font-family:var(--font-bubbly);flex:1}
.library-card-description-v3{font-size:14px;color:#555;line-height:1.5;margin-bottom:15px;font-family:var(--font-clean)}
.library-card-link-v3{display:inline-block;color:var(--hub-medium-green);text-decoration:none;font-size:14px;font-weight:600;transition:all 0.3s;font-family:var(--font-clean);position:relative}
.library-card-link-v3:hover{color:var(--hub-dark-green);transform:translateX(3px)}
/* Search + filter */
.search-filter-bar{background:linear-gradient(135deg,#fff8e7 0%,#fef5e7 100%);padding:24px;border-radius:12px;margin-bottom:30px;box-shadow:0 2px 8px rgba(0,0,0,0.05)}
.search-input-v3{width:100%;padding:12px 20px;font-size:16px;border:2px solid #e7e1cf;border-radius:24px;margin-bottom:16px;font-family:'Quicksand',sans-serif;transition:all 0.3s}
.search-input-v3:focus{outline:none;border-color:#5B8F55;box-shadow:0 4px 8px rgba(91,143,85,0.15)}
.filter-buttons-v3{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.filter-btn-v3{padding:10px 20px;background:white;border:2px solid #e7e1cf;border-radius:24px;font-size:15px;cursor:pointer;transition:all 0.3s;font-weight:500;font-family:'Quicksand',sans-serif}
.filter-btn-v3:hover{border-color:#5B8F55;transform:translateY(-2px);box-shadow:0 4px 8px rgba(91,143,85,0.15)}
.filter-btn-v3.active{background:#2D6B3C;color:white;border-color:#2D6B3C}
/* Hub footer */
.footer-v4{background:var(--hub-dark-green);color:white;padding:3rem 2rem;margin-top:4rem}
.footer-content-v4{max-width:1200px;margin:0 auto;text-align:center}
.footer-text-v4{font-family:var(--font-clean);font-size:1rem;opacity:0.9;margin-bottom:0.5rem}
.footer-links-v4{display:flex;justify-content:center;gap:2rem;margin-top:1.5rem;flex-wrap:wrap}
.footer-link-v4{color:white;text-decoration:none;font-family:var(--font-clean);font-size:0.95rem;transition:opacity 0.3s}
.footer-link-v4:hover{opacity:0.7;color:white}
.footer-copyright-v4{font-family:var(--hub-font-body);font-size:0.85rem;opacity:0.7;margin-top:1.5rem}